如何确定两个文件中使用系统调用中c是相同 [英] how to determine if two file are identical in c using system call

问题描述

我要看看如果2个文件相同
所以我用
结构统计

i need to see if 2 files are identical so i used struct stat

    fdin = open(argv[0],O_RDONLY);
    statos= fstat(fdin, &stat);
    close(fdin);
    fdin = open(argv[1],O_RDONLY);
    statos1= fstat(fdin, &stat1);
    close(fdin);
    printf("file 1 is in size: %lu\n",stat1.st_ino);
    printf("file 2 is in size: %lu\n",stat.st_ino);

结果

file 1 is in size: 9569486
file 2 is in size: 9569479

为什么是st.ino不具有相同的路径相同的文件相同??
我怎么能这样做，如果两个不同的文件是相同的，我可以用系统调用检查

why is the st.ino aren't identical for the same file with the same path?? and how can i do so if two different file are identical i could check it with system call

推荐答案

这是因为你打开两个不同的文件：

It's because you're opening two different files:

./a.out ab.txt ab.txt

的argv [0] 的可执行文件，的argv [1] 为ab.txt。

argv[0] is the executable, argv[1] is 'ab.txt'.

如果你把错误检查到code，这将是明显的。

If you put error checks into your code, it would be clear.

您也正在打印的inode的大小，出于某种原因。

You're also printing the inodes as "size", for some reason.

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